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  4. arsenic sulphide sol is prepared by passing H2S through arsenic oxide solution. The charge developed on the particles is due to absorption of

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Q. arsenic sulphide sol is prepared by passing $ {{H}_{2}}S $ through arsenic oxide solution. The charge developed on the particles is due to absorption of

MGIMS WardhaMGIMS Wardha 2015

Solution:

$ A{{s}_{2}}{{O}_{3}}(aq)+3{{H}_{2}}S(aq)\xrightarrow[{}]{{}}\underset{\begin{smallmatrix} Colloidal \\ sol \end{smallmatrix}}{\mathop{A{{s}_{2}}{{S}_{3}}}}\,+3{{H}_{2}}O $ $ A{{S}_{2}}{{S}_{3}} $ then adsorbs $ {{S}^{2-}} $ ions from $ {{H}_{2}}S $ solution containing $ {{H}^{+}} $ and $ {{S}^{2-}} $ ions and becomes negatively charged.